4.5-42V Wide Vin, Current Mode Dual Synchronous Buck Controller


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 41.3 Iout (Max) (A) 40 Iq (Typ) (uA) 6000 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 750 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 125 Regulated outputs (#) 2 Number of Phases 2 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

WQFN (RTV) 32 25 mm² 5 x 5 open-in-new Find other Buck controllers (external switch)


  • Emulated Peak Current Mode Control
  • Wide Operating Range (4.5 V to 42 V)
  • Easily Configurable for Dual Outputs or Interleaved Single Output
  • Robust 3.3-A Peak Gate Drive
  • Switching Frequency Programmable to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output From 0.8 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switchover to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package

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The LM25119 device is a dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. The LM25119 device drives external high-side and low-side N-channel MOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach pad to aid thermal dissipation.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM25119 Wide Input Range, Dual Synchronous Buck Controller datasheet (Rev. I) Jan. 29, 2018
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) Jul. 03, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles How to use dual buck controllers to power PMICs in automotive applications Nov. 08, 2017
More literature LM5119, LM25119 Quick Start Calculator (Rev. B) Feb. 03, 2017
Application note Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
White paper Power Management IC (PMIC) Guide for Automotive (Rev. A) Oct. 29, 2014
More literature LM5119 and LM25119 Design tool Feb. 26, 2014
User guide AN-2065 LM5119 Evaluation Board (Rev. B) Apr. 24, 2013
User guide AN-2066 LM25119 Evaluation Board (Rev. B) Apr. 24, 2013
User guide AN-2103 LM5117 Evaluation Board (Rev. B) Apr. 24, 2013
User guide AN-2112 LM25117 Evaluation Board (Rev. B) Apr. 24, 2013
Application note 1Q 2012 Issue Analog Applications Journal Jan. 31, 2012
Application note Benefits of a multiphase buck converter Jan. 31, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development


The LM25119EVAL evaluation board provides the design engineer with a fully functional dual output buck converter, employing the LM25119 Dual Emulated Current Mode Synchronous Buck Controller. The evaluation board is designed to provide both 3.3V and 1.8V outputs over an input range of 6.0V to 36V (...)

Design tools & simulation

SNVM384.ZIP (227 KB) - PSpice Model
SNVM482.ZIP (26 KB) - TINA-TI Spice Model
SNVM483.TSC (224 KB) - TINA-TI Reference Design
SNVM484.TSC (154 KB) - TINA-TI Reference Design
SNVM865.ZIP (4 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
LM(2)5119 Quick Start Calculator

Reference designs

35W Dual Output Buck for Industrial Application Reference Design
PMP10664 — The PMP10664 reference design is a 35W dual-output synchronous buck converter using the LM25119 controller IC.  The design accepts an input voltage of 9.8Vin to 15.1Vin, provides one output of 3.3V capable of supplying 6.5A of current and one output of 3.3V capable of supplying 4A of (...)
document-generic Schematic
24V Input Voltage Two Phase Synchronous Buck Converter (12V@20A) Reference Design
PMP20021 — This two phase synchronous buck converter allows smaller components with better distributed thermal performance than an equivalent single phase design. It achieves high efficiency, uses small inductors and easily fits in a small PCB area of 70mm x 70mm.
document-generic Schematic
Non-Isolated LDO for Transportation/Automotive using TPS73201 w/ input of 1.8 VDC 1.3V@0.22A
PMP7177 — The PMP7177.1(5V@0.08A) reference design is a 6W DC/DC sync Buck which uses a LM25119 and was intended for Transportation/Automotive applications. It can generate a Non-Isolated 5 volt output at 0.08 Amps from an input 6.5 to 27 Volts DC. This design has multiple outputs.
TI USB Type-C Dock Reference Design
TIDA-00630 The Type-C Dock Board is designed to help evaluate Type-C Dock implementations with video and charging support.  The Type-C Dock offers data and video port expansion and a charging capability for Type-C systems that support USB PD/Alternate mode protocol.  The dock comes with three (...)
document-generic Schematic
Reference Design - High Efficiency Two-Phase Synchronous Buck Delivers 300W
PMP9700 This two-phase synchronous buck operates from 24VDC and supplies an output of 15V@20A. Operation at 300KHz (per phase) delivers small size and greater than 96% efficiency.
document-generic Schematic
Power Reference Design for Xilinx® Zynq®-7000
PMP7877 The PMP7877 reference design provides all the rails necessary to power a Xilinx® Zynq®-7000 series SoC.  It operates from an input voltage range of 10.8Vin to 13.2Vin and has seven regulated outputs: 1Vout @ 5A, 1.8Vout @ 2.5A, 1.5Vout @ 6A, 3.3Vout @ 5A, 3.3Vout @ 5A, 5Vout @ 2A, and (...)
document-generic Schematic
Dual Phase Synchronous Buck
PMP7876 — This is a dual-phase, synchronous buck converter with an input voltage range of 33V-to-55Vin and an output of 28Vout@14A.
Design files
30 - 32V Input, 5.5V@20A Multiphase Buck using the LM25119
PMP7428 — The PMP7428 reference design uses the LM25119 in a multiphase buck to generate 5.5V@20A. The design achieves over 90% efficiency using high performance NexFETs.
Design files

CAD/CAE symbols

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WQFN (RTV) 32 View options

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